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Multifunctional Properties of Cyanate Ester Composites with SiO2 Coated Fe3O4 Fillers

TitleMultifunctional Properties of Cyanate Ester Composites with SiO2 Coated Fe3O4 Fillers
Publication TypeJournal Article
Year of Publication2013
AuthorsSun, WX, Sun, WZ, Kessler, MR, Bowler, N, Dennis, KW, McCallum, RW, Li, Q, Tan, XL
Journal Interfaces
Date Published03
Type of ArticleArticle
ISBN Number1944-8244
Accession NumberWOS:000316308100017
Keywordsdielectric properties, dielectric-properties, dynamic-mechanical analysis, ester/alumina, magnetite nanoparticles, mechanical stiffening, nanocomposites, oxide, polymer composites, polymer-matrix composites, silica, SiO2 coated Fe3O4 submicrometer spheres, superparamagnetic behavior

SiO2 coated Fe3O4 submicrometer spherical particles (a conducting core/insulating shell configuration) are fabricated using a hydrothermal method and are loaded at 10 and 20 vol % into a bisphenol E cyanate ester matrix for synthesis of multifunctional composites. The dielectric constant of the resulting composites is found to be enhanced over a wide frequency and temperature range while the low dielectric loss tangent of the neat cyanate ester polymer is largely preserved up to 160 degrees C due to the insulating SiO2 coating on individual conductive Fe3O4 submicrometer spheres. These composites also demonstrate high dielectric breakdown strengths at room temperature. Dynamic mechanical analysis indicates that the storage modulus of the composite with a 20 vol % filler loading is twice as high as that of neat resin, but the glass transition temperature considerably decreases with increasing filler content. Magnetic measurements reveal a large saturation magnetization and negligibly low coercivity and remanent magnetization in these composites.

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